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Then it isn't likely we can fix this as I can't see what you've done or are doing. If you want to learn how to post pics then I'll walk you through it, but want to know that you are willing to learn before typing it out.
Sir, this forum has saved my bacon on more than a couple of occasions. And I have had issues putting pics on here before, it would make it a LOT easier trying to show what i'm going through if I could. I am more than willing to learn if you're willing to teach me.
User CP: Go to the upper left of any screen and you will find a link that says User CP. Click on it.
Pictures & Albums: On the left side, the fifth thing down, you will see Pictures & Albums. Click on that.
Create Album: Assuming you don't have an album click on Create Album.
Title: Give the album a name.
Drag & Drop: Assuming you are on a computer and not a mobile device, pull up a window showing the pic(s) you want and drag and drop one or more into the area for that purpose.
Save: Click Save
Skip: Click Skip to get past the thing about the vehicle
Open Album: Click on the album's thumbnail to open the album
Right Click/Copy URL: Right click on the picture you want and select "Copy URL"
Postcard Icon: In the thread put the cursor where you want the pic and click on the little yellow postcard icon.
Paste: Paste the URL from your clipboard into the pop-up
OK: Click OK and then hit Preview Post if in the Advanced Editor or Go Advanced if you want to see what you have before actually posting. Or, just Post
Glad you got the pics to work. Unfortunately the way FTE is loading the pics now, which happened early this week when they updated the software, the pics load so small as to be difficult to see. But those of us that have Sponsor status can directly attach pics and they are still bigger. Let me take some of a 1406 I have and post them directly w/o placing them in an album so they are big. And you could take some closeups of the airhorn, the thing you are holding in the last two pics, but turned upside down so I can see the distance between the float and the airhorn. And another closeup of the needles and seats.
First, what kind of fuel pump do you have? Edelbrock carbs don't like more then 6 psi of fuel pressure and the result will be the needles/seats leak. But, it should not be dramatic. Usually the result of too much pressure is a poor idle as the float level goes up a bit, but not an overflow like you are getting. So this is probably not fuel pressure - but I have to ask.
Second, what kind of fuel filter do you have on the truck? If the truck hasn't been run a lot and there's a chance of the tank having "stuff" in it I run two filters - one ahead of the pump and one between the pump and the carb. And I use the clear filters so I can see when it is time to replace them. And I have had a newly-rebuilt carb have problems because "stuff" got past two filters. That time the accelerator pump discharges plugged, but it could easily have been a flooding problem - like you are having. Carbs are sensitive to "stuff" in the gas, and that might be rust, water, gunk, or basically anything.
Now, cleanliness when rebuilding a carb. It is an absolute necessity, and especially on the tip of the needle where it touches the seat. The tip is Viton, which is a fairly soft material in which debris can embed itself. So I make it a practice of gently wiping the tip off with a clean cloth, and cleaning the seat with a Q-Tip. Below there's a shot of the needle, seat, and the gasket. You do have a new gasket in there and the seat is tight - right? The seat doesn't have to be tightened with lots of leverage, but it needs to be snug.
The next two pics are of float level and drop in that order. Should be right out of the Edelbrock catalog, but maybe the pics will help. After that is a shot showing the way you bend things to get more level and more drop. And do level first and drop second. Further, when you do the bending for drop don't hold on the float as you may bend the level setting spot. And, don't do any bending with the float mounted! That's because the Viton on the tip of the needle can be deformed if you push on the float and that will make the adjustment change later after the pressure is taken off.
Last is a pic of the joint between the float and the air horn. There has to be some clearance there so that the float can easily move. The one in the picture isn't the way I would normally adjust it as I like to have the ears of the float parallel with the tabs on the air horn and fairly close so the float can't move sideways nor be skewed. But, within reason it isn't a problem if the float moves freely.
If you do all of those things the carb should not overflow.
A lot of times I get confused with the drop and level as the level has to be measured with the airhorn upside down and the drop with it right side up. Where I really get confused is if the level is too great or too little that is what affects how full the bowl gets. If you have too little gap the fuller the bowl gets if that makes sense. It's the opposite for the drop. The more gap the emptier the bowl gets before it starts to refill or if you don't have enough gap the bowl is always refilling. At least that's the way I see it.
I had to write that out to make sense of it in my head.
Just thought of something else - the floats are supposed to do just that, float. And if one has a leak it can sink and do exactly what you are seeing.
As for the float level, it works just like a toilet. As the gas is used the float starts down and that let's the needle move away from the seat, which let's gas in and the bowl fills again. But they don't want the float to go all the way down or the needle might actually fall out or get cocked and stuck. So they put the tang on that stops it from "dropping" too far. On the other hand, if it doesn't drop far enough the needle may not get far enough from the seat to allow gas to come in fast enough to keep the bowl full at full throttle. So the drop setting isn't critical.
But, the level of gas in the carb changes the overall air/fuel mix. More fuel in the bowl makes it easier to pull into the stream so the mixture is richer. That's why the float level adjustment is important.
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